[Machine] I heard the Messenger of Allah ﷺ say: "Whoever makes a vow but does not mention it specifically, then its expiation is the expiation of an oath." Khalid ibn Sa'id said, "I think it was Khalid ibn Zaid who narrated this from 'Uqbah regarding the narration of stoning, and the authentic narration from Abu Al-Khair, from 'Uqbah ibn 'Amir, from the Messenger of Allah ﷺ about the expiation of a vow being the expiation of an oath. This is understood by the people of knowledge in relation to the vow of doubt that is released like oaths." And Allah knows best.  

لَسَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ مَنْ نَذَرَ نَذْرًا لَمْ يُسَمِّهِ فَكَفَّارَتُهُ كَفَّارَةُ يَمِينٍ كَذَا قَالَ خَالِدُ بْنُ سَعِيدٍ وَأَظُنُّهُ خَالِدَ بْنَ زَيْدٍ الَّذِي يَرْوِي عَنْ عُقْبَةَ حَدِيثَ الرَّمْيِ وَالرِّوَايَةُ الصَّحِيحَةُ عَنْ أَبِي الْخَيْرِ عَنْ عُقْبَةَ بْنِ عَامِرٍ عَنْ رَسُولِ اللهِ ﷺ كَفَّارَةُ النَّذْرِ كَفَّارَةُ الْيَمِينِ وَذَلِكَ مَحْمُولٌ عِنْدَ أَهْلِ الْعِلْمِ عَلَى نَذْرِ اللَّجَاجِ الَّذِي يَخْرُجُ مَخْرَجَ الْأَيْمَانِ وَاللهُ أَعْلَمُ